#include <bits/stdc++.h>
using namespace std;

int main() {
  int A, B, C, D;
  cin >> A >> B >> C >> D;
  int d = 31 - A + B;
  if (C <= d)
    cout << 1 << endl;
  else if (D <= d)
    cout << 2 << endl;
  else
    cout << 3 << endl;
  return 0;
}